---
product_id: 1392563
title: "Metra 70-5521 Radio Wiring Harness for Ford 03-Up Amp"
brand: "metra"
price: "122.05 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Metra"
url: https://www.desertcart.tn/products/1392563-metra-70-5521-radio-wiring-harness-for-ford-03-up
store_origin: TN
region: Tunisia
---

# 1.5K Ohm pop-eliminator resistor Factory amp integration 2 RCA pre-amp plugs Metra 70-5521 Radio Wiring Harness for Ford 03-Up Amp

**Brand:** metra
**Price:** 122.05 DT
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your ride’s sound with zero cut, zero fuss, all class.

## Quick Answers

- **What is this?** Metra 70-5521 Radio Wiring Harness for Ford 03-Up Amp by metra
- **How much does it cost?** 122.05 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/1392563-metra-70-5521-radio-wiring-harness-for-ford-03-up)

## Best For

- metra enthusiasts

## Why This Product

- Trusted metra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pop-Free Power-Up:** Built-in 1.5K Ohm resistor on amp-remote wire eliminates annoying turn-on pops for a smooth audio experience every time.
- • **OEM-Grade Build Quality:** Thicker OEM cables with factory connectors and extended length for hassle-free installation and long-lasting durability.
- • **Premium RCA Connectivity:** Includes 2 RCA plugs for aftermarket radios’ pre-amp outputs, ensuring crystal-clear audio signal transfer and easy installation.
- • **Steering Wheel Control Ready:** Retain your factory steering wheel audio controls without extra modules—simple wire tap keeps your driving convenience intact.
- • **Seamless Factory Amp Integration:** Plug-and-play harness designed specifically for 2003-2005 Ford, Lincoln & Mercury models to preserve OEM sound quality without cutting wires.

## Overview

The Metra 70-5521 Radio Wiring Harness is a precision-engineered plug-and-play solution for 2003-2005 Ford, Lincoln, and Mercury vehicles. It integrates factory amplifiers seamlessly with aftermarket radios via 2 RCA pre-amp plugs and includes a 1.5K Ohm resistor to eliminate turn-on pops. Designed with OEM-grade cables and connectors, it ensures a clean, professional install that preserves steering wheel controls without additional modules. Trusted by installers for over 70 years, this harness delivers flawless audio upgrades with minimal effort.

## Description

We at Metra always strive to listen to our customers. You have told us to do a better job at telling the Metra sto ry. For over 70 years, Metra has maintained its cutting edge by paying attention to our marketplace and innovating products to fit the needs of the installer. We are the "Installer's Choice" because we are installers. We design our products to be easy to use and easy on the eyes. If you can see a Metra product, then we haven't done our job. Metra Turbokits are designed to be heard but not seen. This means that our fit and finish is the best in the business. Why trust your installation to a shoddy and time consuming kit? Our GSXL Turbowires are designed with the same philosophy in mind. Their longer length for ease of installation and thicker OEM cables with OEM connectors make for a mighty install, with no down time on returns or angry customers.

Review: Does the job, I was just unclear as to wether I needed the amp out plug - Just bought a ‘04 Lincoln Town Car and didn’t know wether it had an amp/sub or not(couldn’t speak with original owner as it was purchased through a family member and the manual was missing) so I went with this harness because if I didn’t need the amp out harness no big deal, but if I did...well then I’d need it lol. The harness itself is perfect for what it is, a simple harness to prevent cutting and splicing the OEM harness, wires were clearly marked and colors matched the harness for the after market stereo. Went with the Pioneer AVH-X490BS, if you get a pioneer look into getting the parking brake bypass switch. The only problem is that there was nowhere to connect the two blue wires on the harness with the RCA plugs, so I assumed I didn’t need it and just didn’t use it. Reconnected negative terminal on battery and tested radio and it worked great so I figured I was right. I go to install the Infinity Kappa speakers in the rear deck(btw if you have a Town Car be ready to take out the entire rear seat, both bottom and rear cushions to get access to the speakers......) and guess what I see?? A sub and amp.... I was planning on getting an amp for the speakers anyways, and maybe a 8” sub just for a little bass so I’ll just wait to get them rather than hook up the factory amp/sub. If you're replacing a radio you can’t go wrong with Metra, always quality products. Been using them as long as I can remember, and between work, my personal vehicles and friends/family I’ve installed more car stereos and speakers than I can remember and never had an issue with Metra.
Review: Steering wheel function, no need to buy extra harness - I used this harness to upgrade to an aftermarket head unit on my 2005 f250 6.0. Worked flawlessly. My new headunit did not come with steering wheel control functions and says you have to buy the harness for it seperately. You do not. Its a very simple process to retain your functions that i learned about way later. Your upgraded headunit will have a harness included. On that harness it will have a wire labeled "Steering wheel key (+)" and it is orange with a black stripe (atleast on mine) Your stock truck harness will have a blue/red stripe wire on Pin #18 that you must tap into. You dont have to cut it, you can simply military splice it, or use a T-tap to connect the SWK wire on your aftermarket radio harness to connect to your factory harness. Once you connect this SWC(+) wire onto the blue/red wire.. you will be able to setup your functions on your radio. Thats it. One wire. No need to buy the access module or the maestro kit thats around 100 if you have a powerstroke. Hope this helps someone.

## Features

- Factory amplifier integration harness
- 2 RCA Plugs plug into aftermarket radio's pre-amp outputs.Includes Ford Lincoln and Mercury 2003-2005 Turbowire and a 8-pin harness with a pair of RCAs for the OE woofer(s)
- One 24-pin power plug and one 8-pin subwoofer plug
- 1.5K Ohm resistor can be used on the amp-remote wire to eliminate turn-on pop
- Allows for the installation of an aftermarket radio using the existing factory wiring and connectors

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000K50GTA |
| Best Sellers Rank | #93 in Car Audio & Video Wiring Harnesses |
| Brand | Metra |
| Brand Name | Metra |
| Cable Type | RCA |
| Connector Type | RCA |
| Customer Reviews | 4.4 out of 5 stars 3,830 Reviews |
| Global Trade Identification Number | 00086429129522 |
| Included Components | Wiring Harness |
| Item Dimensions | 0.02 x 0.02 x 0.02 inches |
| Item Type Name | Sub-Plug For Select 2003-2005 Ford Vehicles With Premier Radio |
| Item Weight | 0.02 Pounds |
| Item dimensions L x W x H | 0.02 x 0.02 x 0.02 inches |
| Manufacturer | METRA Ltd. |
| Material | Copper, TPU |
| Material Type | Copper, TPU |
| UPC | 086429129522 |
| Unit Count | 1.0 Count |
| Warranty Description | Please contact the manufacturer |

## Product Details

- **Brand:** Metra
- **Connector Type:** RCA
- **Item Weight:** 9.07 g
- **Item dimensions L x W x H:** 0.02 x 0.02 x 0.02 inches
- **Material:** Copper, TPU

## Images

![Metra 70-5521 Radio Wiring Harness for Ford 03-Up Amp - Image 1](https://m.media-amazon.com/images/I/41om2WFZ2FL.jpg)
![Metra 70-5521 Radio Wiring Harness for Ford 03-Up Amp - Image 2](https://m.media-amazon.com/images/I/61CORK-mQCL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does the job, I was just unclear as to wether I needed the amp out plug
*by J***F on May 27, 2018*

Just bought a ‘04 Lincoln Town Car and didn’t know wether it had an amp/sub or not(couldn’t speak with original owner as it was purchased through a family member and the manual was missing) so I went with this harness because if I didn’t need the amp out harness no big deal, but if I did...well then I’d need it lol. The harness itself is perfect for what it is, a simple harness to prevent cutting and splicing the OEM harness, wires were clearly marked and colors matched the harness for the after market stereo. Went with the Pioneer AVH-X490BS, if you get a pioneer look into getting the parking brake bypass switch. The only problem is that there was nowhere to connect the two blue wires on the harness with the RCA plugs, so I assumed I didn’t need it and just didn’t use it. Reconnected negative terminal on battery and tested radio and it worked great so I figured I was right. I go to install the Infinity Kappa speakers in the rear deck(btw if you have a Town Car be ready to take out the entire rear seat, both bottom and rear cushions to get access to the speakers......) and guess what I see?? A sub and amp.... I was planning on getting an amp for the speakers anyways, and maybe a 8” sub just for a little bass so I’ll just wait to get them rather than hook up the factory amp/sub. If you're replacing a radio you can’t go wrong with Metra, always quality products. Been using them as long as I can remember, and between work, my personal vehicles and friends/family I’ve installed more car stereos and speakers than I can remember and never had an issue with Metra.

### ⭐⭐⭐⭐⭐ Steering wheel function, no need to buy extra harness
*by V***A on April 11, 2025*

I used this harness to upgrade to an aftermarket head unit on my 2005 f250 6.0. Worked flawlessly. My new headunit did not come with steering wheel control functions and says you have to buy the harness for it seperately. You do not. Its a very simple process to retain your functions that i learned about way later. Your upgraded headunit will have a harness included. On that harness it will have a wire labeled "Steering wheel key (+)" and it is orange with a black stripe (atleast on mine) Your stock truck harness will have a blue/red stripe wire on Pin #18 that you must tap into. You dont have to cut it, you can simply military splice it, or use a T-tap to connect the SWK wire on your aftermarket radio harness to connect to your factory harness. Once you connect this SWC(+) wire onto the blue/red wire.. you will be able to setup your functions on your radio. Thats it. One wire. No need to buy the access module or the maestro kit thats around 100 if you have a powerstroke. Hope this helps someone.

### ⭐⭐⭐⭐⭐ Great fit for 2008 Hyundai Sonata
*by M***A on June 27, 2025*

Even thought this is labeled for Ford, this was a perfect fit for my 2008 Hyundai Sonata. This item comes with two adapters, I did not need to use the harness with the smaller adapter, I believe this might be to connect an amp which I did not need. I was struggling to find the correct adapter for the 2008 Hyundai Sonata because searching on amazon and google were not leading me to this adapter from Metra since it is labeled for Ford. I came across a youtube video with a guy working on the Hyundai Sonata 2008 and he was using this specific cable model Metra 70-5521 on his stereo. So I decided to order it after searching it up and comparing the adapter to the car's factory adapter. It worked out great because it was a perfect fit. I youtubed enough about the basics of wiring cables together, what the different colors mean, pros and cons of wiring directly to the factory unit wiring (using no adapter). I found videos of others removing the stereo for my specific car (I didnt want to just pry it apart and damage something). Then I went the method of butt connectors to link the wires from this harness to the cables of the stereo unit. The connection quality is strong, the cables from this harness are sturdy so they link well. I used it to adapt an aftermarket radio (BOSS Audio Systems 616UAB single din) using the car's existing factory wiring and connectors. I got the single din install kit (Metra 99-7320). I also got the LeeKooLuu Backup Camera and wired it to the Reverse tail light. I installed this for my girlfriend and it passed her approval test. Everything came together perfectly.

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-01-29*